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GREEN TOURMALINE            NATURAL COLOR            Hardness 7.5 
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8.64 cts. Green tourmaline cusion Single 

 11.6 x 11.3 mm. depth: 7.7 mm. Enhancement: none (N)

loupe clean. Tone scale: medium. This stone has an obviously Green color under daylight the coloration is yG and under incandescent light, the coloration is G.

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ORIGIN: Brazil 


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Hardness: 7 - 7.5
Specific Gravity: 3.0+    Visual Catalog

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Tourmaline data

Refractive Index: 1.62 - 1.68
Chemical Composition: Na(Li,Al)3Al6Si6O18(BO3)3 (OH)4, Sodium Lithium Aluminum Boro-Silicate Hydroxide
Crystal Structure: Trigonal
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